#include <stdio.h>
#include <math.h>


//熊贤豪
int main()
{
    double y;
    int x,m;
    for(y = 10;y >= -10;y--)
    {
        m = 2.5 * sqrt(100-y*y);
        for(x = 1;x <30-m;x++)
        {
            printf(" ");
        } 
        printf("*");
        for(;x < 30+m;x++)
            {
                printf(" ");
            }
        printf("*\n");
    }
    return 0;
}